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Old 03-30-2007, 12:14 AM
nat nat is offline
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Best external fuel pump for a TBI 350?

I am looking for a quiet external pump that is reliable for my SBC 350 that I have converted to TBI.

I have a pump, but it is very noisy and only gives me 11psi. I can also install a pressure regulator if the pump puts out too much pressure.

Any thoughts would be appreciated.
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Old 03-30-2007, 10:33 AM
nat nat is offline
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anybody
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Old 03-30-2007, 11:55 AM
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I think Ford has frame mounted electric fuel pump on 89 F150 pickups, this might work for your application.

Ford used external fuel pumps on 1989 era 150 trucks which may be a candidate for use. These are high pressure [port EFI] pumps that will work in most applications. Econoline vans have these as well.

The external pumps used in Ford F150 fuel injected trucks from the 89-93 model years are Delco EP286. At 12 volts, the operating pressure is 70-95 PSI with 36-40 gals per hour. The biggest Delco pump is the EP424, which is 75-90 PSI at 40 gals per hour. EP 268 is a GM# 25117086, EP 424 is a GM# 25176156."
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Old 03-30-2007, 12:28 PM
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Nat -

I assume you are using a GM throttle body. These units are LOW pressure (15 psi) bypass return systems with a built in regulator at the throttle body. Excess fuel gets returned to the tank via the outlet on the throttle body.

Holley makes a low pressure inline pump for these systems but you will find that it is made by Walbro. Cheaper to buy a Walbro. This link will take you to a supplier of the Model GSL395:

http://www.autoperformanceengineerin.../ext_pump.html

Keep the pump mounted below the level of the tank if at all possible. You don't want to run them dry or they're shot in about 5 minutes.

Paul
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